Compote

## 题目描述 Nikolay 要做一份沙拉，他有a个柠檬，b个苹果，c个梨。沙拉中柠檬，苹果，梨的数量比必须是1:2:4 他不能把水果切开——沙拉中的水果数量一定是整数。 求沙拉中放的水果（柠檬，苹果，梨）的总数的最大值 ## 输入格式 第一行输入一个整数a,表示柠檬的数量 第二行输入一个整数b，表示苹果的数量 第三行输入一个整数c，表示梨的数量 数据保证1≤a,b,c≤10001 ## 输出格式 一行，表示沙拉中水果总数的最大值

Nikolay has $ a $ lemons, $ b $ apples and $ c $ pears. He decided to cook a compote. According to the recipe the fruits should be in the ratio $ 1:2:4 $ . It means that for each lemon in the compote should be exactly $ 2 $ apples and exactly $ 4 $ pears. You can't crumble up, break up or cut these fruits into pieces. These fruits — lemons, apples and pears — should be put in the compote as whole fruits. Your task is to determine the maximum total number of lemons, apples and pears from which Nikolay can cook the compote. It is possible that Nikolay can't use any fruits, in this case print $ 0 $ .

The first line contains the positive integer $ a $ ( $ 1<=a<=1000 $ ) — the number of lemons Nikolay has. The second line contains the positive integer $ b $ ( $ 1<=b<=1000 $ ) — the number of apples Nikolay has. The third line contains the positive integer $ c $ ( $ 1<=c<=1000 $ ) — the number of pears Nikolay has.

Print the maximum total number of lemons, apples and pears from which Nikolay can cook the compote.

2
5
7

7

4
7
13

21

2
3
2

0

In the first example Nikolay can use $ 1 $ lemon, $ 2 $ apples and $ 4 $ pears, so the answer is $ 1+2+4=7 $ . In the second example Nikolay can use $ 3 $ lemons, $ 6 $ apples and $ 12 $ pears, so the answer is $ 3+6+12=21 $ . In the third example Nikolay don't have enough pears to cook any compote, so the answer is $ 0 $ .